Changes
which result in movement away from the clear glaze balance would
tend to develop texture and increase opacity.

Changes for
lowering the maturing temperature could alter the textural quality
of the glaze if it was fired to the original temperature. The nature
of the changed texture and opacity would depend on the qualities
displayed by the original glaze.

If the original
glaze was matt and opaque from high levels of Al2O3 and SiO2 then
increases in flux or reductions in Al2O3 & SiO2 might result
in the glaze being clearer with less texture.

Conversely an
already clear and shiny glaze might become more textured with increases
in flux or reductions in Al2O3 & SiO2 as a result of their being
an overload of flux oxides which might generate crystal development
with opacity and texture being increased as a result.

Predicting quality
variations resulting from changes to a recipe is made easier if
the oxide content of the glaze is quantified. The next unit of study
examines a system for analysing the oxide content of a glaze called
Seger (or Unity) formulation.